Draft motor



july 241, i923.

J. YATES DRAFT MOTOR Filed June 6. 1921 "J mi? l ,Hummm "Hummmy /NVE/VTUE' J YA TES' Patented .luly 24, 1923.

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JOHN YATES, OF SAN FRANCISCO, CALIFORNIA.

DRAFT Application filed June 6,

To all whom t may concern:

Be it known that JOHN Yarns, a citizen of the United States, residing atSan Francisco, in the county of San Francisco and State of California,have invented new and useful Improvements in Draft Motors, of which thefollowing is a specification.

rlhis invention relates to improvements in flue draft operated powerunits and resides in the provision of a simple, inexpensive and compactmotor which is particularly adapted for use in connection with the iiueof a stove, furnace or like apparatus and is constructed so as tooperate by force of the draft and products of combustion passingupwardly in the flue.

The primary object of the invention is to provide a motor of thecharacter described which may be made comparatively small and compactand easily installed inf connection with a furnace or stove flue so asto take up little space and will provide maximum power at practically noexpense, for use in operating roasting spits or other stove or furnaceapparatus or other apparatus, such as dynamos and power machinery.

Another object is to provide a motor of the character described whichmay be put into and out of operation at will without interfering withthe furnace or having an undesirable effect on the flue draft.

A further object is to provide a motor of the character described whichmay be used in connection with apparatus other than stove or furnaceflues since it may be operated by any fluid impelling medium and isconstructed so as to permit free passage of Athe fluid regardless of thecharacter of the fluid, thru the motor there being comparatively littleobstruction to the flow offered by the motor.

The invention possesses other advantages and features some of which,with the foregoing will be set forth at length in the followingdescription where I shall outline in full that form of the inventionwhich l have selected for illustration in the drawings accompanying andforming a part of the present specification. In said drawings l haveshown one form of the construction of my invention, but it is to beunderstood that l do not limit myself to such form since the inventionas expressed in the claims may be embodied in a plurality of forms.

Referring to the drawings:

Figure 1 is a front elevation the motor of MOTOR.

1921. Serial N0. 475,223.

this invention, being broken away in part and shown in vertical section.

Figure 2 is a vertical section taken on line 2-2 of Fig. 1.

Figure 8 is a top plan View of the motor.

Figure 4- is a side elevation showing the motor installed with a flueand as used for operating a roasting spit, the flue being broken in partand shown in section.

Referring to the drawing, 1 designates a frame in the upright sides 2 ofwhich a shaft 3 is journalled at its ends as at 4. A cylindrical casing5 surrounds the shaft 3 and houses a rotor 6 secured to said shaft. Onone end of the shaft outside the casing is a fly wheel 7 whereas a gearwheel 8 is fixed to the other end of the shaft.

As shown in Fig. 4, the gear 8 meshes with a pinion 9 and has a roastingspit 10 which latter will extend into a furnace, not

shown. l may use the motor for operating4 y other-devices as desired,the above use being an example only of its many uses.

rlhe line 11 of a furnace oven or stove, not shown, is provided with abranch pipe 12 leading outward and upwardly from one side thereof, theone end of the casing 5 and this pipe serves as the draft intake for thecasing. A damper or valve 13 is mounted in the pipe 12 near its intakeend and a :similar damper let is mounted in the flue 11 just above thepipe 12. An outlet pipe 15 leads from the other end of the casing 5 andback to the Hue 11. The foregoing is exemplary of the manner ofincorporating the motor with the flue of a furnace, stove or oven and itwill be apparent that other analogous means of supplying a flueimpelling medium may be employed if desired.'

The motor comprises a plurality of separate units or impellers 16, 17,18, 19 each of which comprises a hollow cylindrical closed drum 2O fixedto the shaft and having four or more flat blades 21 extending radiallyfrom its periphery. Each unit is mounted in a separate compartment,there being four compartments designated 22, 23, 24 and 25. Thesecompartments are provided by extending a plurality of spaced partitions26, transversely across the casing 5, which latter is closed on allsides except where the pipes 12 and 15 are connected thereto. blades 21extend so that the ends and sides thereof are close to the sides andouter walls of the compartments.

A conduit 27 is formed so as to extend helically around the casing fromthe intake pipe 11 to the outlet pipe 15. This conduit communicates witheach compartment for a distance equal to about one :tourth of thecircumference of each impeller drum, said conipartments being open asshown at 2S and 29 in Fig. 2. The conduit opens into the compartment 22for the impeller 16 near the upper side of the compartment and isstraight as shown at 30, where this communicates', so that one of theblades 21 extends into and practically will close the -conduit at thispoint and will be subjected to the Jr'ull force of the iinpelling mediumpassing thru the conduit. The conduit then curves as at 31, so as toextend around the outer wall 32 of the casing` to the next compartment23 whe-re at a point opposite the portion 30 is communicated with thechamber 23 thru the opening 29. The conduit is straight as at 33 at thispoint so that the blades 21 will close or better, extend fully into theconduit thru the opening 29. The conduit then passes around in anotherarcuate portion 311 around the cylindrical casing wall 32, and o-n tothe conduit 24 where at the next quar` ter point extends into saidchamber in the same manner as shown in Fig. 2 and linally likewisecommunicates with the final cham- -ber 25 and from thence continues tothe out-y let pipe 15.

When the liue damper 111 is closed and the damper 13 opened the draftand products ot combustion will shunt oil thru the pipe 11 and into thehelical conduit 27. This impel-k ments 24 and 25 impinging against theblades 21 of the impellers 18 yand 19 then finally passing out thru thepipe 15 back to the lue. l/Vhen the iirst impeller 16 has made onerevolution the `fluid will have acted upon each or" the four impellers.This results in the provision of a steady and effective power whichtaken out thru the gear wheel, may be transmitted to the spit or anyother mechanism or machine as desired.

The special motor arrangement provides-l iior maximum power development,with minimum resistance to the flow ot the draft or inipellingfluid thruthe motor and in this way soot, cinders, etc., will not be subject todamaging or clogging the motor.

T claim:

1. The combination with an outlet flue, of a casing` remote from theflue, an intake pipe leading oli from the flue to the casing, an outletpipe leading from the casing back to a point in the lue above thecasing, a rotor in the casing, and a helical conduit extending aroundand communicating at spaced points between its ends with the exteriorot' the casing and at its ends with the intake and outlet pipesrespectively.

2, The combination with an outlet iue, of a casing remote from the line,an intake pipe leading oliq from the flue to the casing, an outlet pipeleading upwardly from the casing back to the line, a rotor in thecasing, l and a helical conduit extending around and communicating atspaced points between its ends with the exterior of the casing and atits ends with the intake and outlet pipes respectively7 a damper in theflue above the intake pipe, and a damper in the intake pipe.

JOHN YATES.

